Toshiba Satellite c850 bootup issues

Hello, and thanks in advance i have a Toshiba Satellite c850 series computer every time i try to turn it on it says checking for media then says fail then it comes to a screen that says No bootabel device -- please restart system now my computer never came with a recovery disk and i refuse to buy one it should of came with one its bs is there anyway i can download one or something??? i have windows 8 that came with the computer so obviously no product key or whatever is there any suggestions on what i can do? and just so everyone know's im not very computer literate so please dumb it down for me if you can thank you